--- loncom/auth/lonacc.pm	2004/12/14 20:32:15	1.53
+++ loncom/auth/lonacc.pm	2004/12/20 20:51:23	1.55
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # Cookie Based Access Handler
 #
-# $Id: lonacc.pm,v 1.53 2004/12/14 20:32:15 albertel Exp $
+# $Id: lonacc.pm,v 1.55 2004/12/20 20:51:23 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -117,7 +117,6 @@ sub handler {
                 if ($query) {
 		    &Apache::loncommon::get_unprocessed_cgi($query,['symb']);
                 }
-		&Apache::lonnet::logthis("form.symb is ".$ENV{'form.symb'});
                 if ($ENV{'form.symb'}) {
 		    $symb=&Apache::lonnet::symbclean($ENV{'form.symb'});
                     if ($requrl =~ m|^/adm/wrapper/|) {
@@ -139,6 +138,13 @@ sub handler {
                     }
                 } else {
 	            $symb=&Apache::lonnet::symbread($requrl);
+		    if (!&Apache::lonnet::symbverify($symb,$requrl)) {
+			$r->log_reason('Invalid symb for '.$requrl.': '.
+                                       $symb);
+		        $ENV{'user.error.msg'}=
+                                "$requrl:bre:1:1:Invalid Access";
+  	                return HTTP_NOT_ACCEPTABLE; 
+		    }
                     my ($map,$mid,$murl)=split(/\_\_\_/,$symb);
 		    &Apache::lonnet::symblist($map,$murl => $mid,
                                               'last_known' => $murl);